Broken axle puller



Aug. 11, 1953 J. TARAPACKI 2,648,564

BROKEN AXLE PULLER Filed May 2, 1950 3 2 22 23 zaa I I7 s I IN V EN TOR.

.JO//N TAPPACK/ ATTORNEY Patentecl Aug. 11, 1953 UNITED 'ras ATENTOFFICE 4 Claims.

My invention relates to an axle puller tool that will circumferentiallygrasp a wheel axle and thus enable the easy and efcient withdrawalthereof, which withdrawal is accomplished in a manner superior to thatdone heretofore.

An object of my invention is the production of a tool of the class ofwheel axle pullers that is comparatively simple in Construction and easyof manufacture, yet such manner of Construction enabling a firm holdupon an axle to be pulled.

Other objects and features of my invention will become apparent from thefollowing description relating to the accompanying drawings showing thepreferred form.

Referring to the drawings:

Fig. 1 is a longitudinal cross-section of the wheel axle puller tool;

Fig. 2 is a cross-section View showing the multiple gripping jawstogether with cooperating linkage members;

Fig. 3 is a cross-section View showing the assembly of the multiplepronged jaws at the section of said tool to which said p-ronged jaws arepivotally attached;

Fig. 4 is a detail plan View of one of the prong gripping jaws showingthe vane or web Construction thereon; and

Fig. 5 shows a further detail of one of the prong jaws at the pivotalhinging section thereof.

Referring to the drawings and particularly to Fig. l, the numeral I ildesignates the wheel puller tool proper and lil designates the handlethereof. said handle ie may be either a handle as shown or a hand wheel.said handle is attached to the shaft ll. The handle or hand wheel lil isheld substantially to the shaft I l by means of the lock nut !2, thethreaded opening of which is screwed into said shaft I I. !3 is atubular casing which houses the shaft I I, said shaft being maintainedin central position relative to the inner portion of said casing !3 bymeans of the collars !3 and Hi, and said collars are secured to saidshaft Il by means of pins !3 and M said collars also maintaining saidshaft in position and without appreciable reciprocal movement or playthereof upon the rotation of said shaft l l through the medium of saidwheel lil in either clockwise or counterclockwise direction.

The casing [3 is knurled along the straight section thereof tofacilitate hand gripping of the tool proper ia, upon a wheel axle.

The end of the shaft ll opposite to the handle !2 thereof has a threadedportion H and is contained in a housing 23, theinner section of Z u saidhousing being threaded at 23 and the latter engaging with the threadedsection Il of i the Shaft l l.

The lower portion 22 of 'said housing 23 is of solid rod or blockiormation.

The rotating movement of the shait II impelled by the turning of thewheel or handle u causes the threaded housing 23 to move either forwardor backward in accordance with which direction of rotation the handle orhand wheel [0 is turned.

There are a multiple number of prong jaws IT, each jaw being pivoted at!8 to the lower enlarged section [5 of the casing ll. On the undersideof each prong jaw l'l is a bracket H A link member !9 is pivotallyattached to each of said brackets ll. The opposite end of each linkmember !9 is pivotally attached to the rod or block 22 of the housing23.

The inner gripping portions of the multiple prong jaws I T are knurledor corrugated as at I'I to enable a better grip upon an axle to whichthe tool is applied. The grippng jaws are of reduced cross-section ofmetal in order to reduce the overall diameter of the tool.

IS is the web or vane structure of the grpping jaws !9 for thestrengthening and stability thereof. The structure of the gripping jawswith the inclusion of the web or vane I 6 serves to prevent bending ofsaid multiple jaws ll which are reduced to a minimum thickness in orderto maintain a minimum over-all diameter of said jaws ll.

said jaws are subjected to severe stress when caused to grip a brokenaxle preparatory to the pulling thereof.

The purpose of the threaded portion I I of the shaft H and the threadedportion 23 of the housing 23 is to cause the multiple prong jaws I'! toexpand or to retract upon the rotation of the handle m in one way or theother The expansion of the jaws H enables the fitting of the tool !a tothe wheel axle and the retracting of said jaws enables the g'ripping orclamping thereof. By referring to Fig. 1, it Will be seen that thegripping tool as a whole is exceedingly narrow in diameter such being anessential requirement of a wheel axle pulling tool, such narrowdiametric shaping is attained by the novel manner of pivotally hingingsaid multiple jaws H and the linkage connection between said jaws andthe housing 23.

I am aware that wheel puller tools have been heretofore' employed;however, the present invention offers a new tool of greater utility thanheretofore produced in the fact that a far better h 3 grip is obtainedon a wheel axle through the medium of the multiple number of prong jawsand the particular fulcrums thereof of said jaws having circumferentialgrip on the broken wheel axle, thereby greatly increasing the grip beingvirtually a clamp thereon as compared with the operation of othersimilar wheel axle tools.

As already stated the projecting or end portion of said toolghas 'aminimum over-all diameter when the gripping jaws ll are in closedposition which enables the ready and unobstructed insertion of said toolinto the wheel axle bore, and when so inserted said tool comprising theinvention has a maximum gripping power 'upon the outer surface of abroken wheel axle thus enabling the removal thereof without slippage insuch removal.

The efiort, viz., the rotary movement of the shaft H and the screwthreads H thereof engaged 'in .the block or housing 22 enables acomparatively small expenditure of eiiort on the part of the user ofthis tool.

For -each revolution of the shaft H the housing or block 22 is caused toadvance a distance equal to the pitch of the screw thread 23 'Thus thework input of the turning of the shaft H multipliedby the distance ofthe fulcrum to the 'point where the work ,is tapplied equals the efiort,viz. turns of the shait ii causing the travel thereof.

Futhermore, in Fig. l it will be seen that .there is a pointof leverageof the jaws il at the pivoted hearing 1.8, said bearing being in close`relative .position with the block 22 and with the ;lower ,portion ofthe shaft H and being slightly above :the screw thread 23 thereof.

Thus the position of the jaws i'a' hinged at the bearings [8 and beingin close relative position with sha-ft ii and block 22 enable said jawsto have .added gripping power upon the axle wheel shaft although saidjaws as stated are confine'd .to a restricted and small diametric areawith ;small spread of said jaws because of the enlarged distance betweenthe ulcrum point !8 and the -hinged bearing !9 of the links 59 whichare-pivoted at the terminal end of the block 23. ,Thelinks i?) extenddownwardly from the block 523' and .hinge at the lower ends thereof at'the ;pivot point le securing said links with the gripping jawsrespectively.

It can be seen therefore, that upon the rotation of the wheel m and theconsequent rotation of the -shait l i will cause a downward pressure ofsaid housing or block 22 against the pivot points -s and ta The-pressure of the shaft ll below the pivot point !8 and upon the pivotpoints is and IS below the housing or block 23 in the manner describedgives an added advantage of the lever princ'iple under the general lawof the lever as appli'ed ,to my invention, said leverage being thedistance between -the pivot points s above said housing 22 and the pivotpoints !9 said distance being greater than the distance between thepivot points is and the end portion or gripping jaws of said wheel axlepuller, thereby affording maximum gripping power of said jaws despitelimited diametric dimensions;

What I claim is:

1. In a wheel axle puller tool comprising a casing, :handle means ,atone end thereof, .a shaft :connected tosaid handle means, saidshaft con-:tained within said casing said casing .having an ;enlarged section atthe lower .end thereof, three or more gripping jaws pivotally attached'to said 4 enlarged section of said casing, said shaft having a threadedportion at the lower end thereof. a housing Situated between said jawsbelow said shaft, and below the pivot points of said jaws upon saidenlarged lower section of said casing, said threaded portion of saidshaft rotatable within a threaded aperture in said housing, linkagemeans interjacent with said multiple gripping jaws and the lower portionof said housing and pivotally connected .respectively with each jaw ofsaid multiple jaws and the outer portion of said housing; and collarsecuring means attached to said shaft to hold said shaft within arestricted reciprocal movement upon the rotationofsaid shaft by saidhandle means in either clock-wise or counter-clockwise direction.

:2. *In a tool of the class described comprising a casing, a handle atone end thereof, a shaft within said casing and attached to said handle,aihousing .below said casing, a threaded opening in said housing, saidshaft having a threaded extension, said threaded extension threaded intoand rotating within said threaded opening, col- 'lar means attached tosaid shaft to hold said shaft in said casing and to limit the end play.thereof, multiple gripping jaws surrounding said housing and pivotallyattached to said casing at the other end thereof and above said housing,linkage means attached to each of said gripping jaws and to said housingat the lower outer portion thereof, said multiple gripping jaws orming acircumferential -clamp upon a wheel axle upon the rotation of saidhandle and the release of said clamping of said multiple jaws from saidaxle upon the reverse rotation of the handle aforesaid.

In a wheel axle puller tool comprising a casing, handle means at one endthereof, a shaft within said casing and connected to said handle means,three or more grippingjaws pivotally attached to an enlarged section ofthe lower end of said casing, said shaft having .a threaded portion,.ahousing below said casing and below said pivoting points of saidmultiple jaws, said housing also within the ,central area of said wheelaxle puller tool and surrounded by said gripping jaws, said housinghaving a threaded opening, said threaded portion of said shaft threadedinto said threadedopening, link member means pivotally attached to thelower end of said housing at the outer portion thereof and to thepivotal bearingsoneach of said multiple gripping jaws, whereby thedistance between the pivoted ends of said link member means to saidgripping jaws-and the pivot points thereof attached to casing is greaterthan the distance between said pivoted ends ?of said link member meansto said jaws and .to the end of said gripping portion of said jaws,thereby enabling a maximum gripping force of said multiple jawscircumferentially applied to a wheel axle and forming a clamp thereonupon the rotation of said handle means, and the release of said clampingof said jaws upon said axle upon the reverse rotation of said handlemeans.

4. In a wheel axle gripper tool comprising a casing, handle means at oneend thereof, a shaft within said casing and connected to said handlemeans, an enlarged extension integral to the `lower end of said casing,said shaft extending through said casing and the enlarged extensionthereof, said shaft having a threaded portion a't the end thereof, saidthreaded portion rotatable within a corresponding threaded housing, acollar securely pinned to said shaft 'above said enlarged extension andat a point above said housing, a second collar securely pinned to saidshaft below said enlarged extension of said casing, a multiple number ofgripping jaws pivotally attached to said enlarged extension and at apoint above said housing, a multiple number of link members pivotallyattached to the ends thereof to the lower end of said housing, said linkmembers being also pivotally attached to corresponding gripping jawsaforesaid, the distance between said pivoting points of said linkmembers to said gripping jaws and pivot points of said jaws to saidcasing being greater than the distance between said pivoted points ofsaid links to said jaws and the end or gripping portion of said jaws,whereby a maximum force is exerted at the ends of said j aws incircumferentially clamping a wheel axle for the extraction thereof uponthe rotation of said handle means, and the release of said clamping ofsaid gripping jaws upon the reverse rotation of said handle means, eachof said jaws having a weblike vane integral to the understructure ofsaid jaws thereby strengthening said jaws at the walls thereof againstpressure exerted consequent to the clamping of said jaws upon said wheelaxle.

JOHN TARAPACKI.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,430,702 Troutman Oct. 3, 1922 1,756,441 Smith Apr. 29, 19301,814,368 Chapman July 14, 1931 1,938,419 Freidlein Dec. 5, 1933 FOREIGNPATENTS Number Country Date 161,653 Great Britain Apr. 11, 1921

